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Summary of Significant Accounting Policies (Details)	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Accounting Policies [Abstract]
Percentage of FIFO Inventory	46.00%	57.00%	45.00%
Percentage of Weighted Average Cost Inventory	54.00%	43.00%	55.00%

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- Definition

The percentage of FIFO (first in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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- Definition

The percentage of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods.

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